修改坡度计算逻辑，骑行界面大部分完成

Assets/Plugins/Circle/ImageWithRoundedCorners.cs

@@ -26,8 +26,16 @@ public class ImageWithRoundedCorners : MonoBehaviour {
 		{
 			var rect = ((RectTransform)transform).rect;
 			material.SetVector(Props, new Vector4(rect.width, rect.height, radius*2, 0));
-			gameObject.GetComponent<Image>().material = material;
-			gameObject.GetComponent<Image>().sprite = null;
+
+			if (gameObject.GetComponent<Image>() != null)
+			{
+				gameObject.GetComponent<Image>().material = material;
+				gameObject.GetComponent<Image>().sprite = null;
+			}
+			else if (gameObject.GetComponent<RawImage>() != null)
+			{
+				gameObject.GetComponent<RawImage>().material = material;
+			}
 		}
 		else 
 		{